Add commit hash into vite build

build/commit_hash.js

@@ -0,0 +1,18 @@
+import childProcess from 'child_process'
+
+export const getCommitHash = (() => {
+  const subst = "$Format:%h$"
+  if(!subst.match(/Format:/)) {
+    return subst
+  } else {
+    try {
+      return childProcess
+        .execSync('git rev-parse --short HEAD')
+        .toString()
+        .trim()
+    } catch (e) {
+      console.error('Failed run git:', e)
+      return 'UNKNOWN'
+    }
+  }
+})